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Experimental study on CH4 permeability and its dependence on interior fracture networks of fractured coal under different excavation stress paths

机译：不同开挖应力路径下CH4渗透率及其对煤内部裂缝网络的影响的试验研究

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摘要

CH4 permeation properties of fractured coal are of critical significance to coalbed gas recovery in coal seams. These properties are affected by the fracture network and by the dynamic evolution of fractured coal under excavation loads. Little information is presently available on the characteristics of fracture networks associated with different excavation methods and their influence on the CH4 permeability of fractured coal. This paper presents the results of an experimental investigation into CH4 permeation properties of fractured coal subject to three typical excavation stress paths and their dependence on the evolution of the interior coal fracture network. A triaxial testing machine and microfocus computed tomography (mu CT) were used to measure the permeability of fractured coal and to identify dynamic changes in the interior fracture network under typical excavation loads. Three-dimensional (3D) spatial morphologies and changes in coal fracture networks were characterized using fractal methods. A relationship between CH4 permeability and fractal characterization of the fracture network of coal was formulated. Results show that variations in excavation stress loads associated with different excavation paths induce complicated evolution of the coal fracture network, significantly modifying the CH4 permeability of fractured coal. (C) 2017 Elsevier Ltd. All rights reserved.
机译：裂隙煤的CH4渗透特性对煤层中煤层气的采收具有至关重要的意义。这些特性受裂缝网络和受开挖荷载作用下的压裂煤的动态演化影响。目前关于与不同开挖方法有关的裂缝网络的特征及其对裂缝煤的CH4渗透性的影响的信息很少。本文介绍了在三种典型的开挖应力路径下，裂隙煤的CH4渗透特性及其对内部煤裂隙网络演化的依赖性的实验研究结果。使用三轴试验机和微焦点计算机断层扫描（μCT）来测量压裂煤的渗透率，并确定典型开挖荷载下内部裂缝网络的动态变化。使用分形方法来表征三维（3D）空间形态和煤裂隙网络的变化。建立了CH4渗透率与煤裂隙网络分形特征的关系。结果表明，与不同开挖路径相关的开挖应力载荷变化会引起煤裂隙网络的复杂演化，从而显着改变了裂隙煤的CH4渗透率。 （C）2017 Elsevier Ltd.保留所有权利。

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  • 来源
    《Fuel》 |2017年第15期|483-493|共11页
  • 作者

    Ju Yang; Zhang Qingang; Zheng Jiangtao; Wang Jianguo; Chang Chun; Gao Feng;

  • 作者单位

    China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, Xuzhou 221116, Peoples R China|China Univ Min & Technol Beijing, State Key Lab Coal Resources & Safe Min, D11 Xueyuan Rd, Beijing 100083, Peoples R China;

    China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, Xuzhou 221116, Peoples R China;

    Tsinghua Univ, Sch Aerosp, Dept Engn Mech, Beijing 100084, Peoples R China;

    China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, Xuzhou 221116, Peoples R China;

    China Univ Min & Technol Beijing, State Key Lab Coal Resources & Safe Min, D11 Xueyuan Rd, Beijing 100083, Peoples R China;

    China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, Xuzhou 221116, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    CH4 permeability; Fractured coal; Fracture network; Fractal characterization; Stress paths; Excavation layouts;

    机译：CH4渗透率;压裂煤;裂隙网络;分形表征;应力路径;开挖布置;

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